Re: Fedora 33 System-Wide Change proposal: swap on zram

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On Fri, 2020-06-05 at 10:17 +0200, Igor Raits wrote:
> On Fri, 2020-06-05 at 02:03 -0600, Chris Murphy wrote:
> > On Fri, Jun 5, 2020 at 1:33 AM Igor Raits
> > <ignatenkobrain@xxxxxxxxxxxxxxxxx> wrote:
> > > 
> > > > == Upgrade/compatibility impact ==
> > > > 
> > > > Add Supplements:fedora-release-common to zram-generator to pull
> > > > it in
> > > > on upgrades.
> > > 
> > > I would do it other way around just to keep logic sane.
> > 
> > Hmmm.
> 
> The fedora-release package is a "dummy" one, so there is no reason to
> "Supplement" it because it is meaningless, but having it other way
> around should be better.
> 
> > 
> > > 
> > > > Existing systems without swap will have swap-on-zram enabled.
> > > > 
> > > > Existing systems with swap-on-drive, will also have swap-on-
> > > > zram
> > > > enabled (two swap devices), with higher priority for the zram
> > > > device.
> > > > Existing swap-on-drive will not be removed.
> > > 
> > > It would be nice to see this in action, what kind of issues this
> > > might
> > > bring.
> > 
> > A future feature might be zswap for this case. I've done a lot of
> > testing with that too but I think it needs some synthetic or
> > contrived
> > cases to expose the hypothetically better LRU basis efficiency for
> > what to evict from the cache to the swap-on-disk device. But making
> > it
> > easier for people to do these experiments with real workloads is a
> > big
> > part of the feature, while keeping the defaults conservative for
> > starters.
> > 
> > 
> > > I would appreciate here how to get to the state from swap-on-disk
> > > (default workstation) to the new swap-on-zram (new default
> > > workstation). So that people can see better how they would be
> > > affected
> > > by this change.
> > 
> > Good point. The feature for priority is not yet in zram-generator.
> > A
> > work around is to swapoff /dev/zram0 and then swapon -p 3000
> > /dev/zram0. Now it has higher priority than swap-on-disk.
> 
> I mean to convert existing installation to the new way that would be
> installed from scratch, so have only zram and not have physical swap.
> I
> understand that we do not want to automagically remove physical swap
> on
> upgrade, but it would be nice to have howto that describes how to
> enable zram together with removal of physical swap.

That should also include how to modify resume= parameter and regenerate
BLS / grub configuration.

> > 
> > 
> > 
> > -- 
> > Chris Murphy
> > _______________________________________________
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> > Fedora Code of Conduct:  
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- -- 
Igor Raits <ignatenkobrain@xxxxxxxxxxxxxxxxx>
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